Direct method for preparing doped polyaniline, product prepared thereby and resinous articles containing said product

Abstract

Doped polyanilines are prepared by contacting aniline with an oxidizing agent such as ammonium peroxydisulfate in aqueous solution at a temperature of at most about 10° C. in the presence of at least one organic sulfonic acid, preferably an alkylbenzenesulfonic acid such as dodecylbenzenesulfonic acid. The products may be blended with thermoplastic resins such as polystyrene to produce blends having excellent static discharge properties.

What is claimed is:  
     
       1. A method of isolating polyaniline doped with at least one organic sulfonic acid which comprises precipitating said doped polyaniline from aqueous solution by combination with a mixture of water and a C 1-4  water-miscible alkanol and separating the precipitated polyaniline from said solution. 
     
     
       2. A method according to claim  1  wherein the alkanol-water mixture contains an amount up to about 95% by weight water with the balance being alkanol. 
     
     
       3. A method according to claim  1  wherein the sulfonic acid is an alkylbenzenesulfonic acid. 
     
     
       4. A method according to claim  3  wherein the alkylbenzenesulfonic acid is dodecylbenzenesulfonic acid. 
     
     
       5. A method according to claim  1  wherein the alkanol is 2-propanol.